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Code 21 airbagsystem V8 Driver Initiator Circuit Resistance High - ECU/OBDII - The Lotus Forums #ForTheOwners Jump to content


Code 21 airbagsystem V8 Driver Initiator Circuit Resistance High


Mathias97

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I scanned the airbagsystem with a Tech 1 scanner and got a fault code 21 "Driver Initiator Circuit Resistance High". Status is "Current" and the resistance to drivers airbag is 5.8 Ohm. I cleaned with CRC electronic cleaner the 2 way connector to the passengers inflator module, the 3 way connector to drivers inflator module alongside the steering column and changed both fuses 15 A and 5 A. No result, the code returns immediately ant the resistance is still 5.8 Ohm

Does anybody know what causes the fault code 21? Any suggestion to get rid of this code?

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These are the relevant pages from the Service manual.  You need to follow the decision tree.

The code will clear once the condition is no longer present

Error 21 page 4.jpg

Error 21 page 3.jpg

Error 21 page 2.jpg

Error 21 page 1.jpg

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1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Did you determine the problem?

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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  • 2 months later...
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The resistor module (only used on the single SIR system) is located on the scuttle beam between the steering column and the DERM.

The error code 21 description you gave is for the dual SIR system which means the Service Notes pages above are not applicable if you have the dual SIR system.

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Welcome to TLF.

You should duck over to the Introductions area and say hi in there as well. Post up some photos of your car as well.

You might be lucky and @mike_sekinger & @sailorbob should see this and give you some guidance.

All we know is that when they stop making this, we will be properly, properly sad.Jeremy Clarkson on the Esprit.

Opinions are like armpits. Everyone has them, some just stink more than others.

For forum issues, please contact one of us Moderators.

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At the beginning of this thread are the Service Notes section WA (single SIR) for Code 21.

Here below are the related pages from the Service Notes WC.4 (dual SIR)  related to Code 21.

Follow the decision tree.   It could be a connection issue.

Unfortunately, I do not know the resistance of the load tool, so you may be limited in your responses.183583616_950258389071860_1532876619545974849.jpg.31a437da4594e01e1e59141409476c52.jpg

183517627_588260062095061_3987936202876316808_n.jpg.05700abc7a1114aa4881484d4bd8f781.jpg

182803531_816221192432846_48361555930603651_n.jpg.8e00d91cb815bd70d0b49d7816da1cef.jpg

1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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To anyone still looking for answers, in cases like this when you are dealing with a component borrowed from an American GM product. You need to google like I did, any early 90s Pontiac and I found specific info here

https://www.firebirdnation.com/forums/topic/512689-air-bag-light-flashed-again-tonight/

Its 2.2 ohms on the airbag which you should NOT be checking with a ohmmeter!!!! If you already did and survived that, then great.  Well now you know why the repair manual posted by mike has you checking for voltage instead. 

Thats why there is a dummy load tester tool, it’s a known good expensive 2.2 ohm resistor Gimmick which you can just buy any 2.2 ohm resistor as a dummy load and put it in place of the airbag. I keep some in my tool box because that value seem pretty standard in the industry. There is no actual resistor in the airbag, just an initiator wire that measured out to that. 

Hope this helps. 

Edited by v8GTmac1
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